/*
 * Copyright (c) 2017 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef included_vppcom_h
#define included_vppcom_h

#include <netdb.h>
#include <errno.h>
#include <sys/poll.h>
#include <sys/epoll.h>

/* *INDENT-OFF* */
#ifdef __cplusplus
extern "C"
{
#endif
/* *INDENT-ON* */

/*
 * VPPCOM Public API Definitions, Enums, and Data Structures
 */
#define INVALID_SESSION_ID                  	((u32)~0)
#define VPPCOM_CONF_DEFAULT                  	"/etc/vpp/vcl.conf"
#define VPPCOM_ENV_CONF                      	"VCL_CONFIG"
#define VPPCOM_ENV_DEBUG                     	"VCL_DEBUG"
#define VPPCOM_ENV_API_PREFIX                	"VCL_API_PREFIX"
#define VPPCOM_ENV_APP_PROXY_TRANSPORT_TCP   	"VCL_APP_PROXY_TRANSPORT_TCP"
#define VPPCOM_ENV_APP_PROXY_TRANSPORT_UDP   	"VCL_APP_PROXY_TRANSPORT_UDP"
#define VPPCOM_ENV_APP_NAMESPACE_ID          	"VCL_APP_NAMESPACE_ID"
#define VPPCOM_ENV_APP_NAMESPACE_SECRET      	"VCL_APP_NAMESPACE_SECRET"
#define VPPCOM_ENV_APP_SCOPE_LOCAL           	"VCL_APP_SCOPE_LOCAL"
#define VPPCOM_ENV_APP_SCOPE_GLOBAL          	"VCL_APP_SCOPE_GLOBAL"
#define VPPCOM_ENV_VPP_API_SOCKET           	"VCL_VPP_API_SOCKET"

typedef enum
{
  VPPCOM_PROTO_TCP = 0,
  VPPCOM_PROTO_UDP,
  VPPCOM_PROTO_SCTP,
  VPPCOM_PROTO_NONE,
  VPPCOM_PROTO_TLS,
  VPPCOM_PROTO_UDPC
} vppcom_proto_t;

static inline char *
vppcom_proto_str (vppcom_proto_t proto)
{
  char *proto_str;

  switch (proto)
    {
    case VPPCOM_PROTO_TCP:
      proto_str = "TCP";
      break;
    case VPPCOM_PROTO_UDP:
      proto_str = "UDP";
      break;
    case VPPCOM_PROTO_SCTP:
      proto_str = "SCTP";
      break;
    case VPPCOM_PROTO_TLS:
      proto_str = "TLS";
      break;
    case VPPCOM_PROTO_UDPC:
      proto_str = "UDPC";
      break;
    default:
      proto_str = "UNKNOWN";
      break;
    }
  return proto_str;
}

typedef enum
{
  VPPCOM_IS_IP6 = 0,
  VPPCOM_IS_IP4,
} vppcom_is_ip4_t;

typedef struct vppcom_endpt_t_
{
  uint8_t is_cut_thru;
  uint8_t is_ip4;
  uint8_t *ip;
  uint16_t port;
} vppcom_endpt_t;

typedef uint32_t vcl_session_handle_t;

typedef enum
{
  VPPCOM_OK = 0,
  VPPCOM_EAGAIN = -EAGAIN,
  VPPCOM_EWOULDBLOCK = -EWOULDBLOCK,
  VPPCOM_EFAULT = -EFAULT,
  VPPCOM_ENOMEM = -ENOMEM,
  VPPCOM_EINVAL = -EINVAL,
  VPPCOM_EBADFD = -EBADFD,
  VPPCOM_EAFNOSUPPORT = -EAFNOSUPPORT,
  VPPCOM_ECONNABORTED = -ECONNABORTED,
  VPPCOM_ECONNRESET = -ECONNRESET,
  VPPCOM_ENOTCONN = -ENOTCONN,
  VPPCOM_ECONNREFUSED = -ECONNREFUSED,
  VPPCOM_ETIMEDOUT = -ETIMEDOUT,
  VPPCOM_EEXIST = -EEXIST
} vppcom_error_t;

typedef enum
{
  VPPCOM_ATTR_GET_NREAD,
  VPPCOM_ATTR_GET_NWRITE,
  VPPCOM_ATTR_GET_FLAGS,
  VPPCOM_ATTR_SET_FLAGS,
  VPPCOM_ATTR_GET_LCL_ADDR,
  VPPCOM_ATTR_GET_PEER_ADDR,
  VPPCOM_ATTR_GET_LIBC_EPFD,
  VPPCOM_ATTR_SET_LIBC_EPFD,
  VPPCOM_ATTR_GET_PROTOCOL,
  VPPCOM_ATTR_GET_LISTEN,
  VPPCOM_ATTR_GET_ERROR,
  VPPCOM_ATTR_GET_TX_FIFO_LEN,
  VPPCOM_ATTR_SET_TX_FIFO_LEN,
  VPPCOM_ATTR_GET_RX_FIFO_LEN,
  VPPCOM_ATTR_SET_RX_FIFO_LEN,
  VPPCOM_ATTR_GET_REUSEADDR,
  VPPCOM_ATTR_SET_REUSEADDR,
  VPPCOM_ATTR_GET_REUSEPORT,
  VPPCOM_ATTR_SET_REUSEPORT,
  VPPCOM_ATTR_GET_BROADCAST,
  VPPCOM_ATTR_SET_BROADCAST,
  VPPCOM_ATTR_GET_V6ONLY,
  VPPCOM_ATTR_SET_V6ONLY,
  VPPCOM_ATTR_GET_KEEPALIVE,
  VPPCOM_ATTR_SET_KEEPALIVE,
  VPPCOM_ATTR_GET_TCP_NODELAY,
  VPPCOM_ATTR_SET_TCP_NODELAY,
  VPPCOM_ATTR_GET_TCP_KEEPIDLE,
  VPPCOM_ATTR_SET_TCP_KEEPIDLE,
  VPPCOM_ATTR_GET_TCP_KEEPINTVL,
  VPPCOM_ATTR_SET_TCP_KEEPINTVL,
  VPPCOM_ATTR_GET_TCP_USER_MSS,
  VPPCOM_ATTR_SET_TCP_USER_MSS,
  VPPCOM_ATTR_SET_SHUT,
  VPPCOM_ATTR_GET_SHUT,
} vppcom_attr_op_t;

typedef struct _vcl_poll
{
  uint32_t fds_ndx;
  vcl_session_handle_t sh;
  short events;
  short revents;
} vcl_poll_t;

typedef struct vppcom_data_segment_
{
  unsigned char *data;
  uint32_t len;
} vppcom_data_segment_t;

typedef vppcom_data_segment_t vppcom_data_segments_t[2];

typedef unsigned long vcl_si_set;

/*
 * VPPCOM Public API Functions
 */
static inline const char *
vppcom_retval_str (int retval)
{
  char *st;

  switch (retval)
    {
    case VPPCOM_OK:
      st = "VPPCOM_OK";
      break;

    case VPPCOM_EAGAIN:
      st = "VPPCOM_EAGAIN";
      break;

    case VPPCOM_EFAULT:
      st = "VPPCOM_EFAULT";
      break;

    case VPPCOM_ENOMEM:
      st = "VPPCOM_ENOMEM";
      break;

    case VPPCOM_EINVAL:
      st = "VPPCOM_EINVAL";
      break;

    case VPPCOM_EBADFD:
      st = "VPPCOM_EBADFD";
      break;

    case VPPCOM_EAFNOSUPPORT:
      st = "VPPCOM_EAFNOSUPPORT";
      break;

    case VPPCOM_ECONNABORTED:
      st = "VPPCOM_ECONNABORTED";
      break;

    case VPPCOM_ECONNRESET:
      st = "VPPCOM_ECONNRESET";
      break;

    case VPPCOM_ENOTCONN:
      st = "VPPCOM_ENOTCONN";
      break;

    case VPPCOM_ECONNREFUSED:
      st = "VPPCOM_ECONNREFUSED";
      break;

    case VPPCOM_ETIMEDOUT:
      st = "VPPCOM_ETIMEDOUT";
      break;

    default:
      st = "UNKNOWN_STATE";
      break;
    }

  return st;
}

/* TBD: make these constructor/destructor function */
extern int vppcom_app_create (char *app_name);
extern void vppcom_app_destroy (void);

extern int vppcom_session_create (uint8_t proto, uint8_t is_nonblocking);
extern int vppcom_session_close (uint32_t session_handle);
extern int vppcom_session_bind (uint32_t session_handle, vppcom_endpt_t * ep);
extern int vppcom_session_listen (uint32_t session_handle, uint32_t q_len);

extern int vppcom_session_accept (uint32_t session_handle,
				  vppcom_endpt_t * client_ep, uint32_t flags);

extern int vppcom_session_connect (uint32_t session_handle,
				   vppcom_endpt_t * server_ep);
extern int vppcom_session_read (uint32_t session_handle, void *buf, size_t n);
extern int vppcom_session_write (uint32_t session_handle, void *buf,
				 size_t n);
extern int vppcom_session_write_msg (uint32_t session_handle, void *buf,
				     size_t n);

extern int vppcom_select (int n_bits, vcl_si_set * read_map,
			  vcl_si_set * write_map, vcl_si_set * except_map,
			  double wait_for_time);

extern int vppcom_epoll_create (void);
extern int vppcom_epoll_ctl (uint32_t vep_handle, int op,
			     uint32_t session_handle,
			     struct epoll_event *event);
extern int vppcom_epoll_wait (uint32_t vep_handle, struct epoll_event *events,
			      int maxevents, double wait_for_time);
extern int vppcom_session_attr (uint32_t session_handle, uint32_t op,
				void *buffer, uint32_t * buflen);
extern int vppcom_session_recvfrom (uint32_t session_handle, void *buffer,
				    uint32_t buflen, int flags,
				    vppcom_endpt_t * ep);
extern int vppcom_session_sendto (uint32_t session_handle, void *buffer,
				  uint32_t buflen, int flags,
				  vppcom_endpt_t * ep);
extern int vppcom_poll (vcl_poll_t * vp, uint32_t n_sids,
			double wait_for_time);
extern int vppcom_mq_epoll_fd (void);
extern int vppcom_session_index (vcl_session_handle_t session_handle);
extern int vppcom_session_worker (vcl_session_handle_t session_handle);

extern int vppcom_session_read_segments (uint32_t session_handle,
					 vppcom_data_segments_t ds);
extern void vppcom_session_free_segments (uint32_t session_handle,
					  vppcom_data_segments_t ds);
extern int vppcom_session_tls_add_cert (uint32_t session_handle, char *cert,
					uint32_t cert_len);
extern int vppcom_session_tls_add_key (uint32_t session_handle, char *key,
				       uint32_t key_len);
extern int vppcom_data_segment_copy (void *buf, vppcom_data_segments_t ds,
				     uint32_t max_bytes);

/**
 * Request from application to register a new worker
 *
 * Expectation is that applications will make use of this after a new pthread
 * is spawned.
 */
extern int vppcom_worker_register (void);

/**
 * Retrieve current worker index
 */
extern int vppcom_worker_index (void);

/**
 * Returns the current worker's message queues epoll fd
 *
 * This only works if vcl is configured to do eventfd based message queue
 * notifications.
 */
extern int vppcom_worker_mqs_epfd (void);

/* *INDENT-OFF* */
#ifdef __cplusplus
}
#endif
/* *INDENT-ON* */

#endif /* included_vppcom_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */